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Day: August 2, 2017

I Figured out why the Coins look Different

I Figured out why the Coins look Different Remember the coin experiment that I performed lately? When I washed the coins, they looked different. But why? I finally figured out the answer. Copper metal is oxidized by the Ag1+ to Cu2+ and the Ag1+ ions are reduced by the copper metal to silver metal. But do you remember what the coins are made of? Penny: The alloy remained 95 percent copper and 5 percent zinc until 1982, when the composition was changed to 97.5 percent zinc and 2.5 percent copper (copper-plated zinc) until now. Cents of both compositions appeared… Read more I Figured out why the Coins look Different